Aerobic Sequence Batch Reactors (SBR) are unique configured, activated sludge plants. Central to the SBR design is the use of a single tank for multiple aspects of wastewater treatment, e.g., BODs, TSS’s and nutrient removal. The process operates with a single sludge in a single reactor basin to accomplish both biological treatment and solids-liquid separation. Operators will review the SBR processes and become familiar with process control tests and troubleshooting. Topics include the history of SBRs, process configurations, process operation and controls, aeration and mixing, performance expectations, troubleshooting, and instrumentation and automation control.